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Technician wears an NH3 ammonia protective mask to help an unconscious colleague suffocate urgently due to
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MSA, Ammonia (AM)/Chlorine (CL)/P100/Phosphine (PH), Magenta/Olive Color, Gas Mask Canister - 1MBH8|10059903 - Grainger
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Two MSA All Vision ammonia Respirators from the early 1940s (I assume) the head harness states the mask was patented 1921 but that's obviously not the year these were made. : r/gasmasks
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